Final answer:
The Adams-Onís Treaty, signed in 1819, transferred Florida to the United States and influenced the future border of Oklahoma.
Explanation:
True. The Adams-Onís Treaty, also known as the Transcontinental Treaty, was signed in 1819 between the United States and Spain. It transferred Florida to the United States and established the border between the U.S. and New Spain, impacting the future border of Oklahoma.
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